"Undead" isn't a faction, so being undead does not mean that you are all on the same side. Glom's undead do not like Magnagora's undead do not like the Gutter undead do not like the Shallamarine undead do not like the Cankermore undead do not like the Garwight undead.

That aside, I think if they're going to continue to wander into Magnagora/Hallifax, then they should get "attacked" by guards they encounter - the more guards in the room, the more quickly they die. That'd be a nice touch.

because I don't think it has. Zombies don't eat zombies, and I think it would be a nice flavor if the zombies that are released don't attack other undead creatures or players. I'm just interested in why it is like that though. If there is some lore behind it or something.. @morkarion his answer would have been closest, but zombies being dead shouldn't be capable of emotion.. blah

Why the heck should an organization be able to release the zombies, aggressive to everyone else, and then just ignore them?

Zombies also shouldn't be capable of reason. What do they care whether or not the thing they are eating is undead or not? It's mobile, it's moving, eat it! I don't know why you feel like there needs to be more lore to it than that.

because I don't think it has. Zombies don't eat zombies, and I think it would be a nice flavor if the zombies that are released don't attack other undead creatures or players. I'm just interested in why it is like that though. If there is some lore behind it or something.. @morkarion his answer would have been closest, but zombies being dead shouldn't be capable of emotion.. blah

Lots of dead/undead have emotions. All the major ones do! Look at Ladantine, he's an angry guy, isn't he?